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A Method to Determine the Amounts of Cloud‐top Radiative and Evaporative Cooling in a Stratocumulus‐topped Boundary Layer by Qingqiu Shao; David A. Randall; Chin‐Hoh Moeng; Robert E. Dickinson is a Earth and Planetary Sciences article available to read on EtoBox.

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## Abstract The turbulent processes of a stratocumulus‐topped marine boundary layer are not yet fully understood. Among the issues is the relative importance of the effects of cloud‐top radiative and evaporative cooling in driving the stratocumulus‐topped marine boundary layer turbulence, and in producing cloud break‐up. A better way to analyse the relevant observations is needed. Based on the concepts of mixing fraction and mixing‐line analysis, a new method to quantitatively determine the radiative and evaporative cooling of the entrained air parcels near cloud top is proposed. Quantities δ(__S__~v~,)~R~, which includes evaporative cooling and entrainment mixing warming, and δ(__S__~v~,)~R~,which includes both radiative cooling and the condensation warming due to radiative cooling, are defined to measure the relative importance of entrainment and radiation effects on parcel buoyancy. Provided that radiative cooling does not depend on mixing fraction for a solid cloud, slopes of the mixing lines from the linear regression of aircraft data, rather than the jumps from soundings, can be used to determine δ(__S__~v~,)~E~, and δ(__S__~v~,)~R~. In this way, the information from an extra

Who reads A Method to Determine the Amounts of Cloud‐top Radiative and Evaporative Cooling in a Stratocumulus‐topped Boundary Layer?

Author

Qingqiu Shao; David A. Randall; Chin‐Hoh Moeng; Robert E. Dickinson

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley-Blackwell; Wiley (ISSN 0035-9009)

Published

1997

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)